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Wednesday, October 19, 2011

Shaft Log is In!

Since I broke open a tube of 3M 5200 sealant for the aft deck cleats, I thought I would try and use the rest of the tube for something else before it went bad (in a couple months). With weather cooperating this week, I chose to install the shaft log. I had, some time ago, shimmed and aligned the shaft/aquadrive/shaft log, but I did not permanently set the shaft log.

As always seems to be the case for me, I used WAY too much 5200. There were lots of sticky rags lying around after the job. Oh well, better to use too much than too little on an underwater application.

The important thing here is to keep the shaft centered as much as possible while securing the log and waiting for the goop to set up (couple days). Here the best indicator is how free the shaft will spin. The "sweet spot" has the shaft/thrust bearing spinning a couple rotations under its own momentum with a snap of your hand. If you start to get resistance as you tighten the shaft log's thrubolts, you must back off till it spins freely again.

Make sure there are no gaps between the stern tube flange and the shim. Small gaps, say less than 1/16th of an inch, is ok as long as it is filled with 5200. Let the goop setup for a couple days. Before it is fully cured (not tacky but still flexible), gently tighten the thru-bolts making sure the shaft can still "freely spin" within the bearing.

Previously shimmed and prepared stern tube.
Aquadrive with 'temporary' shaft and coupler.
Notice the centered shaft, standing on its own, not touching the sides of the tube.
Test fitting the shaft log with cutless bearing.
Gooping of shaft log footprint with 3M 5200
Gooping of inside flange of shaft log to ensure a good gasket seal.
Inside the hull. Sealing of shaft log and bronze thru-bolts.
Outside of shaft log with a generous fillet of 5200 around the edges.
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2 comments:

The Incredible Hull said...

Always nice when you put something in with 5200 because "its done". I still hate the stuff and like you limited its use to below the waterline and possibly cleats. Everywhere else there are many other options.

robert s said...

Even so, some of the adhesive "de-bond" products do work nicely on 5200, with a bit of elbow grease. But yes, I anticipate the shaft log never coming out. Not in my lifetime at least.